I don't know if it is the screws that came with the eta or the threaded part but I bought the black and ss and both seem to have problems with the screws catching and tightening . One of my post holes for the screws won't even catch and just falls out when tipped upside down. I'm going to dig through my pile of extra screws and see if I can find a size that fits because if I can fix this problem the rta does really give good flavor.